First real date with my boyfriend and my sister wants to tag along...

Hello. Next Saturday, I'm going on my first date with my current boyfriend. However, my little sister (16 years old) wants to tag along... I told her I wanted it to be just me and my boyfriend due to privacy and she would feel like the third wheel. Anyway, she IS friends with my boyfriend cause we all play WoW together, but I just really don't want her to come with me..

I've asked her numerous times to just stay at home but she gets mad and tries to pull these guilt trips to me. My dad said he didn't care if she came with me or not...-.-..so now she's gonna try to go with me no matter what. I even overheard her trying to get 1-2 of her friends to go with her as well..

Sorry, but I don't feel like babysitting her when I'm on a date...and my dad won't say no that she can't go. What gives?!?!?!? What should I do? This is bullsh*t!
First real date with my boyfriend and my sister wants to tag along...
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